Ouch
Malcolm, that looks like it could have turned out bad. Good thing you got to it before it got serious. There have been alot of dryer fires lately around here due to that type buildup, but a birds nest, that is unusual. I dont vent my dryer permently outside. I know I should upgrade to a metal hose but never leave the house when it is running. Shorthly after I bought these Maytags I had done a load and was throwing it in the ouside vented dryer when the phone rang. I shut the door and forgot to hit the start button but remembered in the morning and did. I heard this real bad banging, opened the door and because it was below zero the night before, that load froze solid. Now I have built an easy to install, take out board that fits in the window when I am using the dryer and vac everything out once a year. I know this is impractical for those that do mega laundry but never realized how much cold can come back through that vent from the outside but its good you dont have to worry about extreme cold where you are like I do, thankfully its finally spring here and will use the clothesline from now on.